Hi @Former-Member. 
I can definitely relate to much of what you have described. Allow me to elaborate...
As I've said before, I'm diagnosed bipolar type 2. I've never had a psychotic break or full-blown mania, but I do get periods of rapid cycling which sound very similar to what you described in your first post in this thread. My rapid cycling is usually triggered by very strong emotional upheaval, such as a major argument with a loved one.
When I rapid cycle, it usually lasts anywhere from a few days to about 3 weeks. It is absolutely exhausting! With absolutely no rhyme or reason, my moods and energy levels will leap about from severe depression-like feelings, to loss of all hope, to bawling my eyes out, to elation, to fits of laughter, to running around like an idiot with way too much energy burning around inside my body, and pretty well anywhere in between. My anxiety (I used to think I didn't suffer from anxiety either - hahaha - how wrong I was) can often spike too at various points during the day without any logic to it.
During rapid cycling, it's like I wake up each day not knowing what state I'm going to be in, or how long it is going to last. I can go through multiple mood states throughout the course of a day, up and down like a yo-yo.
It really does take it out of me. Irritability and uncharacteristic aggression also play their part, but nowhere nearly as bad as when I am suffering from what is known as a "mixed episode". These are the very worst states that I have ever experienced in my life. Thankfully, I have only had a handful of mixed eps. Basically, a mixed episode is depression and hypomania at the same time - it can also be called agitated depression or dysphoric (hypo)mania. Severe agitation and irritation results. It is almost impossible for me to deal with (especially as I am unmedicated). This is when suicidal ideation can rear its ugly head for me, and I must be extremely vigilant and careful.
From what I've been able to tell, my "normal" is a hypomanic high sitting at about 6 or 7 out of 10 (if that makes any sense to you). This is where I spend the majority of my time. Over the course of the past 4 years, I have had mild dips into depression (but nothing like the 6 month major depressions I used to have back when I was ignorant of my mental health issues and pushed myself too far during my highs). I have also had occasional rapid cycling episodes lasting a few weeks each time, and a few mixed episodes lasting up to a week each time.
For the most part, I can keep things on a relatively even keel, but that has taken prodigious effort and lots of learning on my part. At my worst, I need to rely on every single bit of coping mechanism and wellness strategy that I have been able to amass throughout my life just to survive...
@Former-Member, I really hope that things settle down for you. I believe that I have some small understanding of what you might me going through - it is absolutely exhausting not to have any foundation to stand on, to be constantly tossed around by moods and thoughts and energy levels changing and turbulent and chaotic all of the time.
Sending calming ommmmmmm vibes your way...